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Thermodynamic databases for pure substances
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<p>Thermodynamic databases contain information about <a href="/facts/List_of_thermodynamic_properties/d4Kzdqy8">thermodynamic properties</a> for substances, the most important being <a href="/facts/Enthalpy/bBou8lCE">enthalpy</a>, <a href="/facts/Entropy/s52IXeFz">entropy</a>, and <a href="/facts/Gibbs_free_energy/bvenDuzh">Gibbs free energy</a>. Numerical values of these thermodynamic properties are collected as tables or are calculated from thermodynamic datafiles. Data is expressed as temperature-dependent values for one mole of substance at the <a href="/facts/Standard_temperature_and_pressure/JhJv9KFJ">standard pressure</a> of 101.325 kPa (1 atm), or 100 kPa (1 bar). Both of these definitions for the <a href="/facts/Atmospheric_pressure/wJLMSaVG">standard condition for pressure</a> are in use. </p>